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Lookup NU author(s): Dr Seung Chang,
Emeritus Professor Calum McNeilORCiD
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An enzymatic biosensor was fabricated by the covalent immobilization of pyruvate oxidase (PyO) onto the nano-particle comprised poly-5,2′: 5′,2″-terthiophene-3′-carboxylic acid, poly-TTCA (nano-CP) layers on a glassy carbon electrode (GCE) for the amperometric detection of the phosphate ions. The direct electron transfer reaction of the immobilized PyO onto the nano-CP layers was investigated and the electron transfer rate constant was determined to be 0.65 s-1. The electrochemically prepared nano-CP lowered the oxidation potential (+0.40 V versus Ag/AgCl) of an enzymatically generated H2O2 by PyO in a phosphate solution. Experimental parameters affecting the sensitivity of the biosensors, such as amounts of the cofactors, the pH, the applied potential, and the temperature were optimized. A linear response for the detection of the phosphate ion was observed between 1.0 μM and 100 μM and the detection limit was determined to be about 0.3 μM. The response time of the biosensors was about 6 s. The biosensor showed good selectivity towards other interfering anions. The long-term storage stability of the phosphate biosensor was studied and the sensor was applied in a human serum sample for the phosphate ions detection. © 2005 Elsevier B.V. All rights reserved.
Author(s): Rahman MA, Park D-S, Chang S-C, McNeil CJ, Shim Y-B
Publication type: Article
Publication status: Published
Journal: Biosensors and Bioelectronics
ISSN (print): 0956-5663
ISSN (electronic): 1873-4235
PubMed id: 15893466
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